MLA

Kissinger, Henry, 1923-2023. Merkel, Angela with Kissinger at dinner. Box 228, folder 4. Undated, circa 1967-circa 2009. https://collections.library.yale.edu/catalog/12480295.

APA, 6th edition

Kissinger, Henry, 1923-2023. (["Box 228, folder 4"])(Undated, circa 1967-circa 2009)[Merkel, Angela with Kissinger at dinner]. https://collections.library.yale.edu/catalog/12480295.